Back to EveryPatent.com
United States Patent | 5,105,524 |
Darling | April 21, 1992 |
A method for flaring pipe liners. The method includes pushing against the end of a thermoplastic liner installed in a metal pipe with a first forming head and applying heat to cause said head to flare outwardly about an acute angle; and subsequently pushing against said end with a second forming head and applying heat to cause said end to bend into contact with said flange.
Inventors: | Darling; James R. (Oakville, CA) |
Assignee: | Du Pont Canada Inc. (Mississauga, CA) |
Appl. No.: | 568486 |
Filed: | August 16, 1990 |
Current U.S. Class: | 29/890.03; 264/249; 264/269; 264/294; 264/296; 264/322 |
Intern'l Class: | B29C 057/00; B29C 063/64 |
Field of Search: | 264/249,269,294,296,320,322 425/509,518,520,392,393 29/512,513,462,525.1 |
3142868 | Aug., 1964 | Blount | 264/269. |
3435109 | Nov., 1963 | Flaming | 264/296. |
3461505 | Aug., 1969 | Schroeder et al. | 425/392. |
3466707 | Sep., 1969 | Click et al. | 425/392. |
3509252 | Apr., 1970 | Baehr | 264/296. |
3769393 | Oct., 1973 | Bjalme | 264/310. |
4018863 | Apr., 1977 | Schneiders et al. | 264/269. |
4156710 | May., 1979 | Carroll et al. | 264/296. |
4383966 | May., 1983 | Svetlik | 156/286. |
4525319 | Jun., 1985 | Kaspe | 264/322. |
4691740 | Sep., 1987 | Svetlik et al. | 156/286. |
4818314 | Apr., 1989 | Brittain et al. | 264/36. |